JPS63236994A - Shielding member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shield member used in a magnetic head or the like.

[Prior art]

Conventionally, in a magnetic head having a plurality of core elements, a magnetic shield plate is interposed between the far elements to prevent crosstalk between the far elements. A magnetic shield plate is formed by stacking a non-magnetic plate and a magnetic plate, respectively, and as in Japanese Utility Model Publication No. 57-79924 and Japanese Patent Publication No. 56-49365, a magnetic shield plate is formed by stacking a non-magnetic plate and a magnetic plate. A groove in which the winding coil is housed is formed in either the outer non-magnetic plate or the magnetic plate.

As shown in FIG. 10, the former magnetic shield plate has a recess 3a which is a groove in one of the magnetic plate 2 and the non-magnetic plate 3.
The bridge portions 2a and 3b are left in the shape of the magnetic shield plate 16 so that the bridge parts 2a and 3b do not separate from the respective material plates, and the marks 2b and 3c are aligned with adhesive and laminated and bonded, and then the bridge is formed. The magnetic shield plate 16 was completed by cutting the portion.

When a magnetic shield plate is formed as described above, due to variations in the hanging strength of the adhesive, if the amount is large, the stress on the magnetic plate during lamination bonding becomes strong, and the load applied to the magnetic plate deteriorates the magnetic properties of the magnetic plate. There are drawbacks. Further, in addition to providing positioning marks for laminating and adhering each material plate, each material plate requires extra space for reinforcement, which has the drawback of poor material usage efficiency.

In the latter magnetic shield plate, a concave groove is formed by etching a material plate on which a cladding is formed, and serves as a winding storage portion. Since this proposal uses etching, it has the disadvantage that l1g corrosion occurs and the magnetic properties tend to deteriorate.

(Object of the Invention) In view of the above drawbacks, the present invention proposes a shield member having a groove formed without using adhesive or etching.

[Structure of the invention]

The present invention laminates a plurality of material plates by forming a clad,
The purpose is to form crushed concave grooves in this laminated material plate by rolling into irregular shapes or the like.

(Example) The present invention will be described below with reference to illustrated examples. 1 to 4 show a first embodiment, in which a shield member 1 includes a plurality of magnetic plates 2.
and a non-magnetic plate 3 are laminated together by cladding.
is used. This laminated material plate 4 is sandwiched between irregularly shaped rolling rollers 5.5 and crushed by the protruding portion 5a.
As shown in the figure, a material plate 7 having concave grooves 6 on both sides is formed, and this material plate 7 is punched and cut along two-dot chain lines using a press to complete the shield member 1 of FIG. 1.

When the magnetic head mount assembly 8 is formed as shown in FIG. are located at the positions of the grooves 6 formed on both sides of the shield member 1.

In the shield member 1 formed as described above, when the magnetic plate 2 is made of permalloy and the non-magnetic plate 3 is made of nickel silver, the thickness of the concave groove 6 is smaller than the original thickness a as shown in FIG. is b
So, the thickness tl of the magnetic plate 2 that is not crushed and the non-magnetic plate 3
The thicknesses j2, 'j3, (t2=ta) are t1', t2', t3 in the crushed concave groove 6 as a result of irregular shape rolling.
′, (j z′= t3′ ), and the ratio is tl
: t2:ta=tt':t2':t:+', and the material thickness ratio maintains the original ratio.

When the shield member 1 is formed as described above, the concave i#￥5 is formed by irregular shape rolling etc., and the shape of the shield member 1 can be produced using only 71 '51 &<, which simplifies the processing process and reduces the processing cost. is reduced.

Furthermore, since no process is required as in the conventional example, deterioration of magnetic properties is suppressed and a shield member 1 of stable quality can be obtained.

6 to 8 show a second embodiment, in which when the shield member 11 of FIG. 6 is formed, the material plates 4 laminated by cladding are rolled onto a rolling roller 1 having an irregular shape different from the above-mentioned shape.
2.12 is crushed by the protrusion 12a to form a material plate 14 having grooves 13 on both sides as shown in FIG.
The shield member 11 shown in FIG. 6 is completed by punching and cutting along the two-dot chain line using a press.

The material thickness ratio in the second embodiment is the same as in the first embodiment.

FIG. 9 shows an example of application to the shield case 15 of a magnetic head, in which a plurality of material plates are laminated by cladding to form a shield case 15. Rear groove 1
5a is formed.

When the groove 15a is formed in this manner, a filler such as an adhesive enters the groove, and the mount assembly 8 and the fur element 9 can be fixed and will not move.

(Effects of the Invention) As described above, the present invention can be produced by simply crushing the layered material plate by irregular shape rolling etc. to form a concave groove and punching it into the shape of the shield member, so the processing process can be simplified. This makes it possible to provide a shielding member that has excellent effects when used in magnetic heads, etc., because it is simple, reduces processing costs, and does not require the steps required in conventional examples, suppressing deterioration of magnetic properties and stabilizing quality. .

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIGS. 1 to 4 show the first embodiment, and FIG. 1 is an external perspective view of the shield member, and FIG.
The figure is a perspective view of the appearance of the material plates laminated by clad formation before being crushed by the irregularly shaped rolling roller, Figure 3 is a front view of the laminated material plate being crushed by the irregularly shaped rolling roller, and Figure 4 is the irregularly shaped material plate. FIG. 5 is a perspective view of a material plate crushed by a rolling roller, FIG. 5 is a perspective view of a magnetic head mount assembly, FIGS. 6 to 8 are a second embodiment, and FIG. Fig. 7 is an external perspective view of the material plates laminated by clad formation before being crushed by the odd-shaped rolling roller, Fig. 8 is a perspective view of the material plate after being crushed by the odd-shaped rolling O-roller, and Fig. 9 is a cross-sectional side view of an application example implemented in a shield case, Figure 10 is a plan view of a conventional material plate (a),
(b) and a perspective view of the shield plate (c). 1.11... Shield member, 4... Material plate laminated by clad formation, 5.12... Irregularly shaped rolling roller, 6.13... Concave groove. Applicant Sankyo Seiki Seisakusho Co., Ltd. Figure 1 a Figure 3 Figure 4 Figure 8 Figure 10 Figure 9 (c)

Claims (1)

[Claims] A shield member characterized in that a plurality of material plates are laminated by cladding, and crushed grooves are formed in the laminated material plates by rolling into irregular shapes or the like.